1321887317 has 2 divisors, whose sum is σ = 1321887318. Its totient is φ = 1321887316.

The previous prime is 1321887253. The next prime is 1321887319. The reversal of 1321887317 is 7137881231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1176901636 + 144985681 = 34306^2 + 12041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321887317 - 2⁶ = 1321887253 is a prime.

Together with 1321887319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321887319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660943658 + 660943659.

It is an arithmetic number, because the mean of its divisors is an integer number (660943659).

Almost surely, 2^1321887317 is an apocalyptic number.

It is an amenable number.

1321887317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321887317 is an equidigital number, since it uses as much as digits as its factorization.

1321887317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 1321887317 is about 36357.7683171011. The cubic root of 1321887317 is about 1097.4838680146.

The spelling of 1321887317 in words is "one billion, three hundred twenty-one million, eight hundred eighty-seven thousand, three hundred seventeen".